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20121113
20121113
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. and in that environment, you have then the ejection of alpha, beta and gamma particles. so it's almost simple geometry. right now, this particle we'd call an alpha particle. this is a helium nucleus. and i'll write that helium nucleus like this. and i'll put a two down here and a four here. and this nomenclature, i hope you're familiar with. this is simply the atomic number. it tells you it's atomic number two in the periodic table of substances, yeah? it's got two positive charges. and the four refers to the atomic mass unit. and that's the number of nucleons altogether. i call this, by the way, nucleons. i can call you a people, a person, but a person can be a male or female. nucleon can be a proton or neutron. see what i'm saying? but there's four nucleons altogether, so it has a mass of four and atomic number two. so that would be the configuration. if i put another proton in there, then it would now be-- does anyone know? it would be the element lithium because now it would have three and up here would be five. and any nucleus that has three protons, by definition and by chemical properties, will
on the environment. president obama renewed his commitment to "freeing ourselves from foreign oil" in his reelection victory speech last week. energy department data shows u.s. imports of crude had fallen 11% this year and the country is on track to produce the most oil since 1991. the syrian military continues to launch attacks on the border town, sending hundreds of civilians fleeing to neighboring turkey. the new bombings come days after more than 11,000 syrian civilians were forced out during strikes last week, one of the largest refugee flights of this year in conflict to date. speaking in geneva, the head of disaster in crisis management at the international federation of red cross and red crescent societies warned turkey needs major aid to handle the growing number of syrian refugees. >> we have seen a doubling of the camp population since july 2012, and i think as you have seen over the last few days, there has been an increase in the number of syrians moving into turkey. they now recognize the situation is becoming prolonged. the initial thoughts the population might be displaced for shorte
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